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| Eluting effects of different eluents on heavy metals in greenhouse soils from coastal mudflat area |
| ZHENG Fu-le1,2, YAO Rong-jiang1,3, YANG Jing-song1,3, XIE Wen-ping1,3, BO Yan-chao4, ZHANG Xing1,3 |
1. State Key Laboratory of Soil and Sustainable Agriculture/Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Dongtai Institute of Tidal Flat Research, Nanjing Branch of Chinese Academy of Sciences, Dongtai 224200, China;
4. School of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, China |
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Abstract This study employed natural flow rinsing conducted in soil columns and morphological analyses to examine the characteristics of chemical fractions and the removal effect on soil heavy metals induced by different eluents, and to explore the regulation approaches of heavy metals passivation and total abatement. Effects of three different concentrations of the eluents (citric acid, EDTA and straw powder) on the total amount, morphology fractions and removal of Cd, Pb and Cr were investigated. The results showed that, under the saline and sodic soil condition, the leaching rate of soil Cd, Pb and Cr was below 1% using citric acid and straw powder, while the leaching rates of soil Pb and Cd leached by EDTA eluent were 24.62% and 80.56%, respectively. Results of morphological fractions analyses indicated that the influencing extent on chemical fractions of soil Cd, Pb and Cr was ranked as straw powder > EDTA > citric acid, and that EDTA and citric acid could facilitate heavy metal elution by increasing the quantity of acid-soluble and reducible fractions. Meanwhile, EDTA and citric acid also increased available heavy metal content and ecological risk. Straw powder had significant influence on the passivation of Cd and Pb, and facilitated the conversion from other forms to residual form. However, the impact of straw powder on the morphological fraction of soil Cr was not significant.
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Received: 18 April 2018
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